Radiation Therapy Physics- Mosby Board Review Questions
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The half life of Ir 192 is 74 days. The decay constant is:
In2/74= 0.00094 days-1
What are the differences between an electron and a proton?
- Electrons are light, negatively charged particles:they can collide and interact with other particles
- Protons are are heavy, positively charged particles that can only interact with electrons
Types of decay include all of the following EXCEPT:
During x-ray production, the reslting x-ray bem comes from electrons colliding with the target and causing interactions such as:
4) all of the above
all of the above
The positive side of the x-ray tube is known as the:
- "A's are positive :) "
A radioactive source has an initial activity of
60 mCi. It's half life is 8 days. What is the remaining activity after 10 days?
- 25 mCi
The average life of a source with a half life of 8 days is:
- 8 (1.44)=11.5 days
The ratio of x-ray to heat in x-ray production is:
Variable depending on the maximum energy of the electrons traversing the tube
The radioactive decay of a isotope is characterized by its:
An elastic collision is one in which:
the incoming electron gives up all of its energy to the electron it encounters
The energy of an electromagnetic radiation is inversely proportional to its
If a 50 keV electron collides with an inner shell electron with a binding energy of 25 keV, the resulting photoelectron will have an energy of:
The energy of an electromagnetic radiation is directly proportional to its:
List photon interactions:(5)
- pair production
List electron interactions(2):
The decay of Cobalt-60 to stable lead is an example of ____decay.
(gamma rays and beta negative)
Regarding isotopes, isotopes of an element have the same number of______but a different number of neutrons.
Match the following:
Isotopes: ___ A. Ir192 Ir192m
Isobars: ___ B. 27Fe59 27Fe58
Isotones: ___ C. 28Ni60 31Ga60
Isomers: ____ D. 11Na22 10Ne27
- Isotopes: _B__ (7Fe59 27Fe58)
- Isobars: _C__ ( 28Ni60 31Ga60 )
- Isotones: _D__ (1Na22 10Ne27)
- Isomers: _A___ (Ir192 Ir192m)
Ir192 is an ________.
If the decay constant of a particularisotope is 45 sec-1, the half life is:
- 0.015 sec
- In2/decay constant = half-life
If the half-life of Co-60 is 5.26 years, what is the average life?
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